69 ? 23 ? 111 ? 37 ? 1 = 10

+ - \times \div

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\div \times \div +

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+ \div + \div

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\times - - \div

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Solution

The correct option is B $\div \times \div +$
The given equation is:
$69 ? 23 ? 111 ? 37 ? 1 = 10$
After replacing the ? as in alternative (1), the new equation is:
$69 + 23 - 111 \times 37 \div 1 = 92 - 4107 = 4015$
$L H S \neq R H S$
After replacing the ? as in alternative (2), the new equation is:
$69 \div 23 \times 111 \div 37 + 1 = 3 \times 3 + 1 = 10$
Hence, $L H S = R H S$

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37 \times 3 = 111

37 \times 6 = 222

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37 \times 27 ?

37 \times 3 = 111

37 \times 6 = 222

37 \times 9 = 333

37 \times 12 = 444

37 \times 27

Explain why 13*12*11*10+12 and 23*29*31*37+37 are composite numbers?

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